/**
   * If DSM server failed, then no choice to use the default one
   *
   * @return
   */
  private TnContext getDefaultTnContext(TnContext tc) {
    if (tc == null) {
      tc = new TnContext();
    }
    tc.addProperty(TnContext.PROP_MAP_DATASET, DEFAULT_MAP_DATA);
    tc.addProperty(TnContext.PROP_POI_DATASET, DEFAULT_POI_DATASET);
    // Add this property to indicate this is a default dsm config
    tc.addProperty(PROP_DSM_SERVER_STATUS, DSM_SERVER_DOWN);

    logger.debug("getDefaultTnContext>>" + tc.getProperty(TnContext.PROP_MAP_DATASET));
    return tc;
  }